Solving algebraic equations with negative exponents

[Brittany8209]

solve for x: x^-2 = 1/9



solve for x: x^-2 - 13x^-1 +36 = 0



I don't understand how to solve either equations.

 

[Mentallic]

Remember that $$x^{-a}=\frac{1}{x^a}$$ so try multiplying through by x² in both.